Hirobo HI2521076 3 x 6 x 17 mm Collar for Helicopter Shafts  [HI2521076]

Helicopter shaft collar overview

This Hirobo HI2521076 collar is an RC-scale mechanical spacer made for helicopter general parts. As a locating and retention element, it keeps axial position on shafts and within small hobby helicopter assemblies, fitting tight spaces where precise shaft spacing and repeatable alignment are required.

Installation is straightforward for experienced hobbyists: check shaft diameter and bore clearance before fitting, use a controlled press or a light tap to avoid distortion, and verify alignment after installation. The collar operates as a passive tuning part by holding gears, pinions, or bearings at the intended spacing, helping consistent tracking and reducing lateral play.

Inspect the part during routine maintenance for wear or corrosion; replace if roundness or fit is compromised to preserve predictable shaft behavior.